The satellites used for broadcasting television are usually in a geostationary orbit 37,000 km (23,000 mi) above the earth's equator.The advantage of this orbit is that the satellite's orbital period equals the rotation rate of the Earth, so the satellite appears at a fixed position in the sky. If they did not have any motion of their own they would fall back to Earth, burning up in the upper reaches of the atmosphere. Communications will naturally only be possible when it is visible, and dependent upon the orbit it may only be visible for a short period of time. Außerdem weisen sie keine Blinklichter auf wie normale Flugzeuge. b. Ein Satellit (von lateinisch satelles Begleiter, Leibwächter), früher auch Kunstmond, ist in der Raumfahrt ein künstlicher Raumflugkörper, der einen Himmelskörper auf einer elliptischen oder kreisförmigen Umlaufbahn zur Erfüllung wissenschaftlicher, kommerzieller oder militärischer Zwecke umkreist. Just as different seats in a theater provide different perspectives on a performance, different Earth orbits give satellites varying perspectives, each valuable for different reasons. There are also many other types of satellite from weather satellites to research satellites and many others. Because it orbits at the same speed as Earth revolves, a geostationary satellite seems to be stationary if seen from the surface of the Earth.Join nearly 200,000 subscribers who receive actionable tech insights from Techopedia.A satellite in geostationary orbit remains exactly above the equator, so it does not change its position with respect to a location on Earth. Bei einer Flughöhe von 200 km bleiben sie nur wenige Tage auf der Umlaufbahn. In some instances the satellite orbit may be as low as 100 miles (160 km) for a Low Earth Orbit LEO, whereas others may be over 22 000 miles (36000 km) high as in the case of a GEostationary Orbit GEO. A summary of circular orbit definitions is given in the table below:The choice of the satellite orbit will depend on its applications. Circular orbits are classified in a number of ways.
Many communications satellites similarly use a geostationary orbit.Also the new Cubesats or cube satellites use relatively low orbits as well in view of te power levels they can transmit and the allowable path losses.There are a number of definitions associated with various different types of satellite orbits:Other satellite systems such as those used for satellite phones may use Low Earth orbiting systems. Geostationary orbit is a type of geosynchronous orbit of a satellite whereby it moves with the same speed as the rotation of the Earth.
Low Earth Orbit (LEO) is a popular place. For these applications the satellite will take longer than 24 hours to orbit the Earth, and path lengths may become very long resulting in additional delays for the round trip from the Earth to the satellite and back as well as increasing the levels of path loss.In this way the function of the satellite combined with the requirements and allowable path losses govern the orbit into which it must be placed.The actual satellite orbit that is chosen will depend on factors including its function, and the area it is to serve. These objects are called artificial satellites to distinguish them from natural satellites such as Earth's Moon. For a very low orbit of around 100 miles a velocity of about 17500 miles per hour is needed and this means that the satellite will orbit the Earth in about 90 minutes. Terms such as Low Earth orbit, Geostationary orbit and the like detail distinctive elements of the orbit. Because it orbits at the same speed as Earth revolves, a geostationary satellite seems to be stationary if seen from the surface of the Earth. Niedrigfliegende Spionagesatelliten fliegen aus diesem Grund auf stark elliptischen Bahnen.
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